/*
 * Copyright (C) 2016 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.base;

import com.google.common.annotations.GwtIncompatible;

import java.io.Serializable;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * A regex pattern implementation which is backed by the {@link Pattern}.
 */
@ElementTypesAreNonnullByDefault
@GwtIncompatible
final class JdkPattern extends CommonPattern implements Serializable
{
    private final Pattern pattern;

    JdkPattern(Pattern pattern)
    {
        this.pattern = Preconditions.checkNotNull(pattern);
    }

    @Override
    public CommonMatcher matcher(CharSequence t)
    {
        return new JdkMatcher(pattern.matcher(t));
    }

    @Override
    public String pattern()
    {
        return pattern.pattern();
    }

    @Override
    public int flags()
    {
        return pattern.flags();
    }

    @Override
    public String toString()
    {
        return pattern.toString();
    }

    private static final class JdkMatcher extends CommonMatcher
    {
        final Matcher matcher;

        JdkMatcher(Matcher matcher)
        {
            this.matcher = Preconditions.checkNotNull(matcher);
        }

        @Override
        public boolean matches()
        {
            return matcher.matches();
        }

        @Override
        public boolean find()
        {
            return matcher.find();
        }

        @Override
        public boolean find(int index)
        {
            return matcher.find(index);
        }

        @Override
        public String replaceAll(String replacement)
        {
            return matcher.replaceAll(replacement);
        }

        @Override
        public int end()
        {
            return matcher.end();
        }

        @Override
        public int start()
        {
            return matcher.start();
        }
    }

    private static final long serialVersionUID = 0;
}
